android使用include調用內部組件的方法

本文實例講述了android使用include調用內部組件的方法。分享給大家供大家參考。具體如下：

例子一：

sublayout.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:orientation="vertical" 
  android:layout_width="fill_parent" 
  android:layout_height="wrap_content" 
  android:background="#505050" 
  > 
<TextView 
  android:layout_width="fill_parent" 
  android:layout_height="wrap_content" 
  android:text="SubLayout" 
  /> 
<Button 
android:id="@+id/mybutton" 
  android:layout_width="fill_parent" 
  android:layout_height="wrap_content" 
  android:text=" A Button " 
  /> 
</LinearLayout> 
mail.xml 
<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:orientation="vertical" 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent" 
  > 
<TextView 
  android:layout_width="fill_parent" 
  android:layout_height="wrap_content" 
  android:text="@string/hello" 
  /> 
<include android:id="@+id/main1" layout="@layout/sublayout" /> 
<include android:id="@+id/main2" layout="@layout/sublayout" /> 
<Button 
  android:id="@+id/startanotheractivity" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:text=" Start Another Activity " 
  /> 
</LinearLayout> 

如何調用組件include進來的組件呢。

package com.AndroidIncludeLayout; 
import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.Toast; 
public class AndroidIncludeLayout extends Activity { 
  /** Called when the activity is first created. */ 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    View subLayout1 = (View)findViewById(R.id.main1); 
    View subLayout2 = (View)findViewById(R.id.main2); 
    Button myButton_main1 = (Button)subLayout1.findViewById(R.id.mybutton); 
    Button myButton_main2 = (Button)subLayout2.findViewById(R.id.mybutton); 
    Button startAnotherActivity = (Button)findViewById(R.id.startanotheractivity); 
    startAnotherActivity.setOnClickListener(new Button.OnClickListener(){ 
  @Override 
  public void onClick(View arg0) { 
  // TODO Auto-generated method stub 
  Intent intent = new Intent(); 
       intent.setClass(AndroidIncludeLayout.this, AnotherActivity.class); 
       startActivity(intent); 
  }}); 
    myButton_main1.setOnClickListener(new Button.OnClickListener(){ 
  @Override 
  public void onClick(View arg0) { 
  // TODO Auto-generated method stub 
  Toast.makeText(AndroidIncludeLayout.this, "Button 1 Pressed", Toast.LENGTH_LONG).show(); 
  }}); 
    myButton_main2.setOnClickListener(new Button.OnClickListener(){ 
  @Override 
  public void onClick(View arg0) { 
  // TODO Auto-generated method stub 
  Toast.makeText(AndroidIncludeLayout.this, "Button 2 Pressed", Toast.LENGTH_LONG).show(); 
  }}); 
  } 
}

但是如果include進來的xml，是

sublayout.xml

<?xml version="1.0" encoding="utf-8"?> 
<merge xmlns:android="http://schemas.android.com/apk/res/android"> 
<TextView 
  android:layout_width="fill_parent" 
  android:layout_height="wrap_content" 
  android:text="SubLayout" 
  /> 
<Button 
android:id="@+id/mybutton" 
  android:layout_width="fill_parent" 
  android:layout_height="wrap_content" 
  android:text=" A Button " 
  /> 
</merge> 

則以上的方法將不能實現，會報空指針。
因為用了merge後，導入進來就相當於是當前view下的組件了，所以直接findViewById就可以了。
 
這樣的話。。。可以解決了include 多次同一個layout的問題

希望本文所述對大家的Android程序設計有所幫助。